Electromagnetic and thermal analysis of distributed cooled high power millimeter wave windows

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Description

The sectional high-frequency internally-cooled window, as proposed by General Atomics, has unique potential for allowing microwave sources to reach multi-megawatt CW levels with application to ECRH. Designs are being investigated using computational electromagnetic (EM), thermal, and mechanical codes at 110 GHz and 170 GHz to examine the design tradeoffs between RF performance and thermal mechanical safety margins. The EM analyses are for the window, under vacuum at one MW and includes variations in the shapes of the cooling fins, the surface treatment of the window elements themselves, the cooling fin tip treatment, the window pitch angle, and the waveguide effects. ... continued below

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14 p.

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Nelson, S.D.; Reitter, T. & Caplan, M. May 12, 1995.

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Description

The sectional high-frequency internally-cooled window, as proposed by General Atomics, has unique potential for allowing microwave sources to reach multi-megawatt CW levels with application to ECRH. Designs are being investigated using computational electromagnetic (EM), thermal, and mechanical codes at 110 GHz and 170 GHz to examine the design tradeoffs between RF performance and thermal mechanical safety margins. The EM analyses are for the window, under vacuum at one MW and includes variations in the shapes of the cooling fins, the surface treatment of the window elements themselves, the cooling fin tip treatment, the window pitch angle, and the waveguide effects. One advantage of the distributed cooled window is it`s extensibility to higher power levels. Results in the modeling efforts are presented showing the EM field concentrations (which then will feed into the thermal analysis), the energy scattering/reflection, the transmitted launch angle variation as a function of physical geometry, and the spatial energy distribution and loss as a function of time and position.

Physical Description

14 p.

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OSTI as DE95016064

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  • 11. topical conference on radio frequency in plasmas, Palm Springs, CA (United States), 17-19 May 1995

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  • Other: DE95016064
  • Report No.: UCRL-JC--119969
  • Report No.: CONF-9505105--11
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 90727
  • Archival Resource Key: ark:/67531/metadc794558

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 12, 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 23, 2016, 1:33 p.m.

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Nelson, S.D.; Reitter, T. & Caplan, M. Electromagnetic and thermal analysis of distributed cooled high power millimeter wave windows, article, May 12, 1995; California. (digital.library.unt.edu/ark:/67531/metadc794558/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.